Proc macros to reduce boiler plate

[NickLarsenNZ]

Dapr seems quite easy to get going in other languages that provide annotations/attributes.
I think the same should be done for the Rust SDK.

For example:

[Topic("pubsub", "orders")]
[HttpPost("/checkout")]
public async Task<ActionResult<Order>>Checkout(Order order, [FromServices] DaprClient daprClient)
{
    // Logic
    return order;
}

Could be expressed as:

#[topic(pub_sub_name = "pubsub", topic = "orders")]
#[post("/checkout")]
async fn hello(order: Order) -> String {
    format!("Order id: {}", order.id)
}

Am I right in thinking that the difficulty comes in the variety of HTTP server crates? Or is that quite decoupled from decorating the handler?

[NickLarsenNZ]

Maybe it doesn't even need to consider HTTP handlers. It could just be a standalone event handler.

[zedgell]

@NickLarsenNZ I have added a PR for the Procedural Macro for the pub sub topic.

#87

[NickLarsenNZ]

Nice one @zedgell

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